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Sökning: WFRF:(Scott Christopher) > Rapport > Report of the Bench...

  • Almqvist, GustafUniversity of Stockholm, Stockholm Sweden (författare)

Report of the Benchmark Workshop on Baltic Cod Stocks (WKBALTCOD)

  • BokEngelska2015

Förlag, utgivningsår, omfång ...

  • Copenhagen :ICES,2015
  • 172 s.
  • printrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:his-11477
  • https://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-11477URI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:vet swepub-contenttype
  • Ämneskategori:rap swepub-publicationtype

Serie

  • ICES CM 2015/ACOM ;35

Anmärkningar

  • The ICES Benchmark Workshop on Baltic Cod Stocks (WKBALTCOD), chaired by External Chair Jean-Jacques Maguire, Canada and ICES Chair Marie Storr-Paulsen, Denmark, and attended by two invited external experts Verena Trenkel, France and Meaghan Bryan, USA met in Rostock, Germany, 2–6 March 2015 with 39 participants and six countries represented. The objective of WKBALTCOD was to evaluate the appropriateness of data and methods to determine stock status and investigate meth-ods appropriate to use in the single-stock assessment for the cod stock in SD 22–24 and cod in SD 25–32 in the Baltic. Participants in the workshop were a large group with diverse backgrounds representing the industry, fisheries, NGOs, managers and scientists.The single-stock analytic assessment of the eastern Baltic stock was not accepted by the assessment working group (WGBFAS) in 2014 due to severe problems with the input data. The advice for the eastern Baltic cod was, therefore, based on the ICES approach for data-limited stocks. As an outcome ICES decided to establish a bench-mark for both cod stocks and to scope an integrated assessment for the Baltic cod stocks. The first meeting (WKSIBCA) was therefore meant to introduce the interces-sional work conducted since the assessment working group in April 2014, and to reach some conclusions on how to proceed both in the short term (Benchmark in March 2015) and longer term (2–3 years) and was seen as a data compilation work-shop, there is produced a separate report from this workshop. The WKBALTCOD was the 2nd meeting in the benchmark process and was intended to come up with a final stock assessment method, stock annex and input data for both stocks. As it was not possible to reach conclusive decision on the final model to be used for the east Baltic cod stock during the benchmark meeting and as more work on the preferable models was needed, it was decided by the ACOM leadership to prolong the bench-mark process until the assessment working group meeting in April 2015. This deci-sion has led to a relatively long process partly mixed with the assessment working group WGBFAS.It became clear during the benchmark process that although large effort has been put into explaining the underlying processes leading to the changes in the Baltic ecosys-tem, there is still some lack of understanding of the present situation in the eastern Baltic cod stock. Therefore, it was not possible to reach firm conclusions on the final model to be used and therefore not possible to set reference points. It was decided to continue to explore the most promising models and to continue to improve the input data until the assessment working group started in April.The main challenges still to be solved for the Eastern Baltic cod stock is the quantifi-cation of increased natural mortality and decrease in growth. Through several presentations during the workshop (both WKSIBCA and WKBALTCOD) it became clear that natural mortality very likely has increased in later years, due to decreased condition and increased parasite infection. A decrease in growth also seems plausible duo to a decrease in condition and/or selectivity-induced mortality of the largest in-dividuals. However, as none of these parameters are easily estimated, especially with the severe ageing problems, different model assumptions made the output very shaky.For the western Baltic cod, stock identification issues were examined in area SD 24, the intermediate area: based on otolith characteristics and genetics. Due to the results showing a large proportion of east cod in this area, it was decided to split the catch2 | ICES WKBALTCOD REPORT 2015and survey from SD 24 into either the western or eastern Baltic cod stock. It was pos-sible to derive proportions of eastern and western cod in SD 24 back to the mid-1990s.For the western Baltic cod stock a modelled survey indices was included in the as-sessment covering the western part of SD 24 and Area 22+23 and based on a smoothed ALK.Both cod stocks have in the past used commercial tuning fleet to have a better cov-ered of older age groups. It was decided to abound this time-series duo quality issues such as a limited coverage and problems with technical creeping.WKBALTCOD was not able to explore and define reference points for the Western Baltic cod stock during the meeting due to time constraints, but these were calculated and decided by correspondence after the meeting. The recent protocols on estimation procedures developed by WKMSYREF3 for stocks with a full analytical assessment and for data-limited stocks served as objective guidelines to obtain reference point estimates.

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Andersen, MichaelDanish Fishermen’s Association, Fredericia, Denmark (författare)
  • Willestofte Berg, CasperDTU Aqua – National Institute of Aquatic Resources Section for Fisheries Advice, Charlottenlund, Denmark (författare)
  • Broadgate, WendyThe Fisheries Secretariat (FISH), Stockholm, Sweden (författare)
  • Bryan, MeaghanNational Oceanic and Atmospheric Administration Southeast Fisheries Science Center, Miami, United States (författare)
  • Campana, StevenFisheries and Oceans Canada Bedford Institute of Oceanography, Dartmouth, Canada (författare)
  • Cardinale, MaxSwedish University of Agricultural Sciences Institute of Marine Research, Lysekil, Sweden (författare)
  • Casini, MicheleSwedish University of Agricultural Sciences Institute of Marine Research, Lysekil, Sweden (författare)
  • Dierking, JanLeibniz-Institut für Meereswissenschaften, Kiel, Germany (författare)
  • von Dorrien, ChristianThünen Institute Baltic Sea Fisheries, Rostock, Germany (författare)
  • Eero, MargitDTU Aqua – National Institute of Aquatic Resources, Charlottenlund, Denmark (författare)
  • Efimov, YuriRussian Federal Research Institute of Fisheries & Oceanography (VNIRO), Moscow, Russian Federation (författare)
  • Gasyukov, PavelAtlantNIRO, Kaliningrad, Russian Federation (författare)
  • Hemmer-Hansen, JakobDTU Aqua – National Institute of Aquatic Resources Department of Inland Fisheries, Silkeborg, Denmark (författare)
  • Hjelm, JoakimSwedish University of Agricultural Sciences Institute of Marine Research, Lysekil, Sweden (författare)
  • Holmgren, NoélHögskolan i Skövde,Institutionen för biovetenskap,Forskningscentrum för Systembiologi,Ekologisk modellering, Ecological modeling(Swepub:his)holn (författare)
  • Horbowy, JanNational Marine Fisheries Research Institute, Gdynia, Poland (författare)
  • Hüssy, KarinDTU Aqua – National Institute of Aquatic Resources, Charlottenlund, Denmark (författare)
  • Johansson, ReineBaltic Sea Advisory Council, Dyrön, Sweden (författare)
  • Jonusas, StanislovasDGMare, Brussels, Belgium (författare)
  • Kornelius, GeorgeInstitute of Food Safety, Animal Health and Environment (BIOR) 8 Daugavgrivas Str. Fish Resources Research Department, Riga, Latvia (författare)
  • Köster, FritzDTU Aqua – National Institute of Aquatic Resources Section for Fisheries Advice, Charlottenlund, Denmark (författare)
  • Kraak, SarahThünen Institute, Braunschweig, Germany (författare)
  • Krumme, UweThünen Institute Baltic Sea Fisheries, Rostock, Germany (författare)
  • Large, ScottInternational Council for the Exploration of the Sea, Copenhagen, Denmark (författare)
  • Larsson, StaffanSwedish Cod Fishermen’s Producer Organisation, Lycke, Sweden (författare)
  • Luzenczyk, AnnaNational Marine Fisheries Research Institute, Gdynia, Poland (författare)
  • Lövgren, JohanSwedish University of Agricultural Sciences Institute of Marine Research, Lysekil, Sweden (författare)
  • Maguire, Jean-JacquesGodefroy, Quebec, Canada (författare)
  • Mosegaard, HenrikDTU Aqua – National Institute of Aquatic Resources, Charlottenlund, Denmark (författare)
  • Nielsen, AndersDTU Aqua – National Institute of Aquatic Resources, Charlottenlund, Denmark (författare)
  • Norrström, NiclasHögskolan i Skövde,Institutionen för biovetenskap,Forskningscentrum för Systembiologi,Ekologisk modellering, Ecological modeling(Swepub:his)nori (författare)
  • Oeberst, RainerThünen Institute Baltic Sea Fisheries, Rostock, Germany (författare)
  • Stepputtis, DanielThünen Institute Baltic Sea Fisheries, Rostock, Germany (författare)
  • Stern, EdwardThe Fisheries Secretariat (FISH), Stockholm, Sweden (författare)
  • Storr-Paulsen, MarieDTU Aqua – National Institute of Aquatic Resources Section for Fisheries Advice, Charlottenlund, Denmark (författare)
  • Strehlow, Harry VincentThünen Institute Baltic Sea Fisheries, Rostock, Germany (författare)
  • Svedäng, HenrikSwedish University of Agricultural Sciences Institute of Marine Research, Lysekil, Sweden (författare)
  • Trenkel, VerenaIfremer Nantes Centre, Nantes, France (författare)
  • Wæver Pedersen, MartinDTU Aqua – National Institute of Aquatic Resources Section for Fisheries Advice, Charlottenlund, Denmark (författare)
  • Zimmermann, ChristopherThünen Institute Baltic Sea Fisheries, Rostock, Germany (författare)
  • University of Stockholm, Stockholm SwedenDanish Fishermen’s Association, Fredericia, Denmark (creator_code:org_t)

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